I'm assuming you already took these two pills, but this info will probably be useful for you for future use.
1 hour prior to ingestion, eat a hearty meal loaded with lipids (fat). Fast food, butter, whatever
45 minutes prior to ingestion, take 600mg Cimetidine (Tagamet)
30 minutes prior to ingestion, take 50mg-75mg Diphenhydramine (Benadryl), or if you happen to have some arouned hydroxyzine (Vistaril); same dose
30 minutes prior to ingestion, 2 standard dosing units of a Dextromethorphan containing medicine; Nyquil, Coricidin, Robitussin etc.
Swallow oxycodone orally
Wait 15 minutes or so until first effects are noticeable, smoke a little cannabis and have a beer or two depending on your tolerance to both things.
I hope this helps, this is what I do when I don't have enough opiates to get as high as I want. Nothing will beat having more of your chosen substance, but this method of potentiation is legit and I think you'll notice the difference.